Remove const from argv argument in sample.cc

PiperOrigin-RevId: 627746353
Change-Id: Ib27f9e911a74565d99a7bf0a173085c513047878

sample/compile.cc

@@ -89,7 +89,8 @@ int filetype(const char* filename) {
 
 
 // main function
-int main(int argc, const char** argv) {
+int main(int argc, char** argv) {
+
   // model and error
   mjModel* m = 0;
   char error[1000];